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Interest Bearing Deposits (Major Types Of Interest Bearing Deposits) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Banking and Thrift [Abstract]    
Interest bearing demand $ 2,524,534 $ 2,340,471
Money market 6,930,815 6,645,390
Savings 1,471,475 1,492,685
Time, $100,000 or greater 3,420,446 2,947,084
Time less than $100,000 1,220,859 1,044,389
Total interest bearing deposits $ 15,568,129 $ 14,470,019